It's interesting that Henry's time travel is only semi-random. Sometimes he winds up in a barn in Muncie, Indiana, or being chased by the cops in Chicago, but a lot of the time he finds himself with people who are important in his life: his mother, Clare, Kimy, himself. It's as if he can physically be present and be a participant in his own memories and his, for lack of a better term, emotional priorities. He revisits the scene of his mother's death because it's an emotional focal point in his life. Survival skills are important to him--the ability to acquire what he needs when he suddenly finds himself naked in some random place--so he goes back to teach himself those skills. He goes back to Kimy because after his mother's death, she became his surrogate mother, the person who made him feel safe and taught him to cook. And of course, he goes back to Clare over and over.
He can't change what happens--that's a major point in the book. He can't save his mother from death, or even himself from being embarrassed by his father. But he can be there, he can see himself and others in his life in a much more direct way than memory allows.
If you had chrono-impairment, where do you think you would find yourself, and with whom? What could you learn from it?